INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of income (loss) before income taxes
Domestic									$ 4,691	$ 37,095	$ (43,518)
Foreign									26,424	26,612	26,720
Income (loss) from continuing operations before income taxes	15,849	12,721	(11,446)	13,991	15,289	13,867	16,800	17,751	31,115	63,707	(16,798)
Income (loss) from discontinued operations											3,084
Current:
Federal									(8,132)	382	2,938
State									673	686	848
Foreign									2,099	757	518
Total current									(5,360)	1,825	4,304
Deferred:
Federal									10,434	15,168	(15,516)
State									5	1,337	(2,167)
Foreign									(20)	(1,001)	(606)
Total deferred									10,419	15,504	(18,289)
Total income tax provision (benefit)	4,471	2,449	(4,667)	2,806	4,118	3,882	4,536	4,793	5,059	17,329	(13,985)
Income tax provision (benefit) from discontinued operations											1,173
Income tax provision (benefit) differing from a provision computed at the U.S. statutory tax rate
Tax at federal statutory rate									10,892	22,298	(5,879)
State income taxes									644	692	(1,304)
Differences in foreign tax rates									(8,232)	(9,545)	(7,759)
Stock-based compensation									103	585	442
Research and development credits									(2,045)	(136)	(1,608)
Nondeductible expenses									852	166	288
Accruals for intercompany payments									1,884	1,947	1,889
Change in tax rates									122	1,078	0
Non-deductible DOJ settlement									10,998	0	0
Settlement of IRS examination									(10,542)	0	0
Other									383	244	(54)
Total income tax provision (benefit)	$ 4,471	$ 2,449	$ (4,667)	$ 2,806	$ 4,118	$ 3,882	$ 4,536	$ 4,793	$ 5,059	$ 17,329	$ (13,985)